Mechanical and tribological properties of spark plasma sintered Nb–Al2O3 composites

Dotta, Aline Luisa Bandeira; Serafini, F.L.; Ordoñez, M.F.C.; Machado, Izabel Fernanda; Farias, M.C.M.

doi:10.1016/j.ceramint.2020.11.023

Cited by 3 publications

(2 citation statements)

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“…The wear mode diagram shows a distinction between wear rate levels of alumina and niobiumtoughened alumina composites and a good correlation with the proposed severity of contact and brittleness index. In dry sliding conditions at room temperature, niobium-alumina composites with enhanced fracture toughness show less wear under lower contact severity conditions [273].…”

Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

“…With natural changes in the LFS team, several of the previous initiatives have been maintained, such as the use of different techniques to model tribological phenomena, e.g. in lubricated contacts [262][263][264][265], using finite element modelling [266] and molecular dynamics [267]; the interest in the mechanical and tribological behaviour of thin films and coatings [268][269][270][271]; the use of SPS [271][272][273][274][275]; the interest in lubricated contact and its impact on energy efficiency [53, [276][277][278][279][280]; abrasive processes [281][282][283][284]; and wheel-rail contact [285][286][287].…”

Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

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Brazilian Tribology: origin, status quo and future perspectives

de Mello,

Costa

2023

Surf. Topogr.: Metrol. Prop.

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This first regional issue published in STMP highlights the potential and importance of the research carried out in Latin America regarding surface engineering and tribology. In order to celebrate this important initiative, a complete historical account of Brazilian tribology is presented for the first time. It initiates with the first steps of Brazilian tribology in the 1980s, followed by the evolution and expansion of tribology research both in academic centres and industry. Focus is given to two outstanding achievements of Brazilian tribology: the fully flexible engines that run at any proportion of ethanol and gasoline and a fully innovative, completely oil-less family of hermetic compressors. The status-quo of the current research groups on tribology is described. Finally, the future trends envisaged by the Brazilian tribology community are presented.

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Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

Brazilian Tribology: origin, status quo and future perspectives

de Mello,

Costa

2023

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

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High‐Temperature Compressive Behavior of Refractory Alumina–Niobium Composite Material

et al. 2022

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The development of coarse‐grained refractory composites combining refractory ceramics with refractory metals provides new approaches for high‐temperature applications. In particular, coarse‐grained Nb‐Al2O3 composites are widely interested due to their promising functional properties such as high thermal shock resistance, low shrinkage and good electrical conductivity. In order to identify and release the potential of these materials in advanced applications, their mechanical behavior should be evaluated. This study presents room‐ and high‐temperature compression behavior up to 1500 °C of Nb‐Al2O3 refractory composites manufactured via castable and extrusion technology. The influences of production method, particle size, open porosity as well as temperature and strain rate are discussed. For comparison, pure niobium and alumina specimens are used as reference materials. The results indicate that Nb‐Al2O3 refractory composites show high ductility at high temperatures. This behavior is also verified with microstructural investigations by scanning electron microscope (SEM).

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